Ring size conversion chart
Ring sizes are just the inside diameter or circumference of the band. Measure your finger's circumference with a strip of paper, divide by π (3.14) to get the diameter, then read across the chart. Measure at the end of the day when fingers are largest.
| Inside diameter (mm) | US | UK | EU (circumference mm) | JP |
|---|---|---|---|---|
| 14.0 | US 3 | F | 44 | 4 |
| 14.9 | US 4 | H½ | 47 | 7 |
| 15.7 | US 5 | J½ | 49 | 9 |
| 16.5 | US 6 | L½ | 52 | 11 |
| 17.3 | US 7 | N½ | 54 | 14 |
| 18.1 | US 8 | P½ | 57 | 16 |
| 19.0 | US 9 | R½ | 59 | 18 |
| 19.8 | US 10 | T½ | 62 | 20 |
| 20.6 | US 11 | V½ | 64 | 23 |
| 21.4 | US 12 | X½ | 67 | 25 |
| 22.2 | US 13 | Z½ | 69 | 27 |
| 23.0 | US 14 | Z+1 | 72 | 30 |
Notes
- EU sizes are the inner circumference in mm (diameter × π).
- Between sizes? Choose the larger for wide bands, the smaller for thin bands.
- Knuckles bigger than the base? Measure the knuckle and size to it.
Frequently asked questions
- How do I measure my ring size at home?
- Wrap a thin strip of paper snugly around the finger, mark the overlap, measure the length in mm — that is the circumference; divide by 3.14 for the diameter and read the chart.
- What is US size 7 in EU?
- US 7 has an inside diameter of 17.3 mm, which is EU size 54 (circumference), UK N½ and JP 14.
- Do ring sizes differ for men and women?
- The scales are identical; average sizes differ — women commonly US 5–7, men US 9–11.